docs: def generate_help(config_cls, **kwargs):
      """
      Autogenerate a help string for a config class.
  
      If a callable is provided via the "formatter" kwarg it
      will be provided with the help dictionaries as an argument
      and any other kwargs provided to this function. That callable
      should return the help text string.
      """
      try:
          formatter = kwargs.pop("formatter")
      except KeyError:
          formatter = _format_help_dicts
      help_dicts = _generate_help_dicts(config_cls)
      return formatter(help_dicts, **kwargs)